netdev - Re: [PATCH v2 15/45] rcu: Use get/put_online_cpus

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Wed, 26 Jun 2013 14:34:58 -0700
From:	Tejun Heo <tj@...nel.org>
To:	"Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>
Cc:	Steven Rostedt <rostedt@...dmis.org>, peterz@...radead.org,
	fweisbec@...il.com, oleg@...hat.com, walken@...gle.com,
	mingo@...nel.org, linux-arch@...r.kernel.org,
	vincent.guittot@...aro.org, xiaoguangrong@...ux.vnet.ibm.com,
	wangyun@...ux.vnet.ibm.com, paulmck@...ux.vnet.ibm.com,
	nikunj@...ux.vnet.ibm.com, linux-pm@...r.kernel.org,
	rusty@...tcorp.com.au, namhyung@...nel.org, tglx@...utronix.de,
	laijs@...fujitsu.com, zhong@...ux.vnet.ibm.com,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org, sbw@....edu,
	David Laight <David.Laight@...LAB.COM>,
	akpm@...ux-foundation.org, linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH v2 15/45] rcu: Use get/put_online_cpus_atomic() to
 prevent CPU offline

Hey,

On Wed, Jun 26, 2013 at 11:58:48PM +0530, Srivatsa S. Bhat wrote:
> Yes, we were discussing hot-unplug latency for use-cases such as
> suspend/resume. We didn't want to make those operations slower in the
> process of removing stop_machine() from hotplug.

Can you please explain why tho?  How much would it help in terms of
power-saving?  Or are there other issues in taking longer to shut down
cpus?

Thanks.

-- 
tejun
--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html